#!/bin/sh

# Slackware build script for gcc-4.9.4

# Copyright 2017 Vasily Sora USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

PRGNAM=gcclegacy494
VERSION=${VERSION:-4.9.4}
BUILD=${BUILD:-5}
TAG=${TAG:-_SBo}

INSTLOC=${INSTLOC:-/opt/$PRGNAM}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i386" ]; then
  SLKCFLAGS="-O2 -march=i386 -mcpu=i686"
  LIBDIRSUFFIX=""
  LIB_ARCH=i386
elif [ "$ARCH" = "i486" ]; then
  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
  LIBDIRSUFFIX=""
  LIB_ARCH=i386
elif [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
  LIB_ARCH=i386
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686"
  LIBDIRSUFFIX=""
  LIB_ARCH=i386
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
  LIB_ARCH=s390
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
  LIB_ARCH=amd64
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O3 -march=armv7-a -mfpu=vfpv3-d16"
  LIBDIRSUFFIX=""
  LIB_ARCH=armv7hl
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
  LIB_ARCH=$ARCH
fi

case "$ARCH" in
    arm*) TARGET=$ARCH-slackware-linux-gnueabi ;;
       *) TARGET=$ARCH-slackware-linux ;;
esac

if [ "$ARCH" = "x86_64" ]; then
  GCC_ARCHOPTS="--disable-multilib"
else
  GCC_ARCHOPTS="--with-arch=$ARCH"
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf gcc-$VERSION
tar xvf $CWD/gcc-$VERSION.tar.gz
cd gcc-$VERSION

tar xjf $CWD/mpfr-2.4.2.tar.bz2
ln -sf mpfr-2.4.2 mpfr
tar xjf $CWD/gmp-4.3.2.tar.bz2
ln -sf gmp-4.3.2 gmp
tar xzf $CWD/mpc-0.8.1.tar.gz
ln -sf mpc-0.8.1 mpc
tar xjf $CWD/isl-0.12.2.tar.bz2
ln -sf isl-0.12.2 isl
tar xzf $CWD/cloog-0.18.1.tar.gz
ln -sf cloog-0.18.1 cloog

chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
  -o -perm 511 \) -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

# Do not run fixincludes
cp -v gcc/Makefile.in{,.orig}
sed 's@\./fixinc\.sh@-c true@' gcc/Makefile.in.orig > gcc/Makefile.in

# Apply patches if we are compiling against glibc version greater than 2.23
minor="$(ldd --version | head -1 | sed -e 's/.*2\.//')"
if [ "$minor" -gt "23" ]; then
  patch -p1 -i "$CWD/942-asan-fix-missing-include-signal-h.patch"
  patch -p1 -i "$CWD/943-Use-ucontext_t-not-struct-ucontext-in-linux-unwind.h.patch"
  patch -p1 -i "$CWD/944-sanitizer-linux.patch"
  patch -p1 -i "$CWD/ustat.h.patch"
  if [ "$minor" = "26" ]; then
    export glibcxx_cv_c99_math=yes
  fi
fi

rm -rf $TMP/objdir
mkdir $TMP/objdir
cd $TMP/objdir

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
../gcc-$VERSION/configure --prefix=$INSTLOC \
   --program-suffix=-$VERSION \
   --enable-languages=c,c++ \
   --with-system-zlib \
   --libdir=$INSTLOC/lib$LIBDIRSUFFIX \
   --enable-threads=posix \
   --disable-gtktest \
   --target=${TARGET} \
   --build=${TARGET} \
   --host=${TARGET} \
   $GCC_ARCHOPTS \
   --with-arch-directory=$LIB_ARCH \
   --enable-clocale=gnu \
   --with-gnu-ld \
   --enable-shared \
   --enable-__cxa_atexit
make
make DESTDIR=$PKG install-strip

# Thank you to 'idlemoor'
mkdir -p $PKG/usr/bin
cd $PKG/usr/bin
for COMPILER in gcc g++ ; do
  sed \
    -e "s~%LIBDIRSUFFIX%~$LIBDIRSUFFIX~" \
    -e "s~%COMPILER%~$COMPILER~" \
    -e "s~%INSTLOC%~$INSTLOC~" \
    < $CWD/wrapper.sh \
    > $PKG/usr/bin/$ARCH-slackware-linux-$COMPILER-$VERSION
  chmod ugo+x $PKG/usr/bin/$ARCH-slackware-linux-$COMPILER-$VERSION
done
ln -s $ARCH-slackware-linux-gcc-$VERSION $PKG/usr/bin/gcc-$VERSION
ln -s $ARCH-slackware-linux-g++-$VERSION $PKG/usr/bin/g++-gcc-$VERSION

mv -f $PKG$INSTLOC/share/man $PKG/usr/man
cd $PKG/usr/man/man7
# we do not need these; according to "diff" there is no difference between these files
# and the ones Slackware ships with; except this man page named "gfdl.7"; which shall be
# saved; and renamed so that it does not conflict with Slackware's.
find . ! -name 'gfdl.7' -exec rm -rf {} \;
mv gfdl.7 gfdl494.7
find $PKG/usr/man -type f -exec gzip -9 {} \;
for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done

mv -f $PKG$INSTLOC/share/info $PKG/usr/info
rm -f $PKG/usr/info/dir
cd $PKG/usr/info
#rename the .info files so they do not conflict with Slackware's own .info files.
for info in *.info; do mv "$info" "${info%.*}-$VERSION.info"; done
gzip -9 $PKG/usr/info/*.info*

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}
